Clean the MAF sensor with electrical cleaner then blow dry with light shop air or just let air dry.then disconnect battery for about 30 minutes to reset keep alive memory.Should take care of your problem.

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if its a 5r55s i know what the problem is, the bushings become clogged in the solenoid block, i just did the procedure on my 05 explorer, there is multiple videos on you tube about it, what was it doing before you rebuilt it? if the overdrive warning light was blinking, i know for sure that is the issue

it sounds like you may have 2 problems.1st vacuum leaks are fairly easy to find if they change idle/accelleration,alot of times you can hear it,the use of carberator cleaner spraying different vac hoses & gaskets while engine idles to see a difference in the way the engine idles(goes up/ down in rpm's)or using a unlit propane torch.if its a very tiny vac leak then a smoke test can be done.your hunting to find rev/drive maybe a worn switch or linkage

Try changing the fuel filter. Sounds like fuel restriction or exhaust restriction. It's also possible the timing chain could be loose especially if an high mileage engine. Fuel filter first & go from there. Good luck!